Create a spaceindex macro to display all the documents in a space

To continue transforming the main dashboard in a dashboard with gadgets, the all documents listing (used on space dashboards) should be done in a macro.

I propose following:

• name: spaceindex
• parameters:
  • count: optional, the number of items to display. If there are more items in that space, a link to the Main.SpaceIndex for that space will be added (just like the current behaviour of the documents listing on the Main.Dashboard). If missing, a default number will be used, 100 for example.
  • space: optional, the name of the space to display the documents for. If missing, current space would be used

In the future, an extra parameter should be added, to specify the style of the listing: livetable or list (ftm only list will be implemented).